[I apologize if this question has been asked - as it surely must have
been already - my searches didn't get me to the answer in the
archives. You can send me some better search terms and I'll be happy
with that as an answer, thanks!]
The Mathematica 5.1 help browser entry for Symbol under "Further Examples"
defines a function SymbolQ1 to determine if something is a Symbol as
follows:
Attributes[SymbolQ1] = {HoldAllComplete};
SymbolQ1[expr_] := AtomQ@Unevaluated[expr] && Head@Unevaluated[expr]===Symbol
Then it shows the following:
In:= SymbolQ[Pi]
Out= True
In:= {a definite integral evaluating to Pi} == Pi
Out= True
In:= SymbolQ[that definite integral]
Out= False
Yet FullForm[Pi] is the same as FullForm[that definite integral], and is Pi.
So I have two questions:
1) Why isn't SymbolQ[that definite integral] == True? What is it if
it isn't a Symbol?
2) Why are FullForm[Pi] and FullForm[that definite integral] different?
Thanks! -- Dave